Abstract

The stability of wide-area power system with multiple time-varying delays is investigated in this study. It is known for all that power system is a delay system for wide area measurement information of power system. Therefore, transmission time delay can not be ignored and it has great impact on the controller design. The steady stability analysis model of power system with multiple time-varying delays is constructed. The criterion of stability is formulated as feasibility problems of linear matrix inequality. According to the characteristics of the time-varying delays, the feedback controller is separated into two parts: The first level of control is derived from local signals without time delay and the second level of control is supplied from other generators with different time-varying delays. Taking a four-machine power system as example, the performance of the proposed controller is validated by the results of simulation in time-domain and it is proved that the proposed method is effective.

Keywords:

Feedback controller, multiple time-varying delays, power system, Wide-Area Measurement System (WAMS),

References

Competing interests

The authors have no competing interests.

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Copyright

The authors have no competing interests.